What is the direction of the magnetic lines of force?

What is the direction of the magnetic lines of force?

Lines of force always form individual CLOSED LOOPS around the magnet. Lines of force have a definite DIRECTION from North to South. Lines of force that are close together indicate a STRONG magnetic field.

Is a magnet made with iron nickel or cobalt?

There is a group of materials known as ferromagnetic materials. This group includes iron, cobalt, nickel, and some alloys of rare earth elements (mainly neodymium and samarium). These ferromagnetic materials can be made magnetic by exposing them to a magnetic field using electric current.

Is Cooking in aluminum pans safe?

Our science editor reports that the consensus in the medical community is that using aluminum cookware poses no health threat. In short: While untreated aluminum is not unsafe, it should not be used with acidic foods, which may ruin both the food and the cookware.

Can aluminum and stainless steel touch?

Stainless steel is an alloy of carbon steel that is, itself, resistant to corrosion. However, stainless steel is reactive with aluminum, and when a stainless steel screw is in contact with an aluminum base metal, the aluminum is likely to corrode. This will help on contact with aluminum.

Is there a reaction between stainless steel and aluminum?

The combination of aluminum and stainless steel causes galvanic corrosion. In order to understand why you shouldn’t use stainless steel and aluminum together, we first need to understand how galvanic corrosion works. Galvanic corrosion is the transfer of electrons from one material (anode) to another (cathode).

What happens when aluminum and steel touch?

“Note that aluminum is close in activity with steel. However, they are still dissimilar metals and are subject to considerable galvanic corrosion when in contact in a corrosive atmosphere. If this condition exists, the smaller active metal could corrode at an accelerated rate.

How can we prevent galvanic corrosion between steel and aluminum?

Galvanic Corrosion Prevention

1. Select metals/alloys as close together as possible in the galvanic series.
2. Avoid unfavorable area effect of a small anode and large cathode.
3. Insulate dissimilar metals wherever practical.
4. Apply coatings with caution.
5. Avoid threaded joints for materials far apart in the galvanic series.

How do you neutralize galvanic corrosion?

Galvanic corrosion can be prevented by:

1. Selecting materials with similar corrosion potentials.
2. Breaking the electrical connection by insulating the two metals from each other.
3. Applying coatings to both materials.
4. Separating the two materials by inserting a suitably sized spacer.

How do you fix Aluminium to steel?

You electrically insulate the aluminum from the steel. The best way to do this is to use bolts and nuts to make the joint. Use an isolating coating or paint on the aluminum and the steel to isolate them electrically. However, all of your effort will go for nothing if you just bolt the joint together.

Why can steel and Aluminium be separated by a magnet?

Magnets do not stick to aluminum or copper, nor to many other electrically conductive metals. How can magnets help separate these materials from other stuff? The answer lies with Eddy Currents. If you move a magnet near a piece of conductive metal, the moving magnetic field induces currents in the metal.

How steel and aluminum cans can be separated using a magnet?

Aluminium cans are separated from other materials using an eddy current separator, which repels the material. The cans are then shredded into small pieces and passed through a magnetic drum to ensure that any remaining pieces of steel are removed.